One token that I believe has POS mining enabled on ERC 20 token is POS token. They did some airdrops last year and they aren't too well known but I believe you can mine and stake through that smart contract. Not sure how it works though, that was too many steps for me to undertake.
Yeah, I believe it was actually the first to do so, hence their name. I just checked my ETH address after reading this, suddenly recalling that I might have some and I do indeed. In fact, it seems I was sent a small amount the second time after receiving the first, almost 3 months ago, so I'm wondering actually if it's "auto" staking.
Interesting topic to follow, I didn't know Wagerr was going through this step.